无法将 output 参数从一个工作流模板传递到另一个工作流模板的工作流

Question

我有两个工作流模板generate-output ， lib-read-outputs和一个工作流output-paramter ，如下所示

1. generate-output.yaml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: generate-output
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:

          # Generate Json for Outputs
          - name: read-outputs
            arguments:
              parameters:
                - name: outdata
                  value: |
                    {
                      "version": 4,
                      "terraform_version": "0.14.11",
                      "serial": 0,
                      "lineage": "732322df-5bd43-6e92-8f46-56c0dddwe83cb4",
                      "outputs": {
                        "key_alias_arn": {
                          "value": "arn:aws:kms:us-west-2:123456789:alias/tetsing-key",
                          "type": "string",
                          "sensitive": true
                        },
                        "key_arn": {
                          "value": "arn:aws:kms:us-west-2:123456789:alias/tetsing-key",
                          "type": "string",
                          "sensitive": true
                        }
                      }
                    }
            template: retrieve-outputs

    # Create Json
    - name: retrieve-outputs
      inputs:
        parameters:
          - name: outdata
      script:
        image: 145565074481.dkr.ecr.us-west-2.amazonaws.com/infssdev-or-infpl-python:v3
        command: [python]
        env:
          - name: OUTDATA
            value: "{{inputs.parameters.outdata}}"
        source: |
          import json
          import os
          OUTDATA = json.loads(os.environ["OUTDATA"])
          with open('/tmp/templates_lst.json', 'w') as outfile:
            outfile.write(str(json.dumps(OUTDATA['outputs'])))
        volumeMounts:
          - name: out
            mountPath: /tmp
      volumes:
        - name: out
          emptyDir: { }
      outputs:
        parameters:
          - name: message
            valueFrom:
              path: /tmp/templates_lst.json

2. lib-read-outputs.yaml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: lib-read-outputs
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:
          # Read Outputs
          - name: lib-wft
            templateRef:
              name: generate-output
              template: main

3. output-paramter.yaml

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: output-paramter-
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:
          # Json Output data task1
          - name: wf
            templateRef:
              name: lib-read-outputs
              template: main

          - name: lib-wf2
            dependencies: [wf]
            arguments:
              parameters:
                - name: outputResult
                  value: "{{tasks.wf.outputs.parameters.message}}"
            template: whalesay

    - name: whalesay
      inputs:
        parameters:
          - name: outputResult
      container:
        image: docker/whalesay:latest
        command: [cowsay]
        args: ["{{inputs.parameters.outputResult}}"]

我正在尝试通过lib-read-outputs将工作流模板生成generate-output中生成的 output 参数传递给工作流output-paramter

当我执行它们时，它给出以下错误 - Failed: invalid spec: templates.main.tasks.lib-wf2 failed to resolve {{tasks.wf.outputs.parameters.message}}

Answer 1

默认情况下，DAG 和步骤模板不会产生输出

即使只有一个子模板，DAG 和步骤模板也不会自动生成其子模板的输出。

例如，这里的no-outputs模板不会生成 output，即使它调用的模板确实具有 output。

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
spec:
  templates:
  - name: no-outputs
    dag:
      tasks:
      - name: get-an-artifact
        template: get-an-artifact

如果您考虑具有多个任务的 DAG 模板，那么缺少输出是有道理的：

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
spec:
  templates:
  - name: no-outputs
    dag:
      tasks:
      - name: get-an-artifact
        template: get-an-artifact
      - name: get-another-artifact
        depends: get-an-artifact
        template: get-another-artifact

no-outputs输出应该产生哪个任务的输出？ 由于不清楚，DAG 和步骤模板在默认情况下根本不会产生输出。

您可以将模板视为函数。 您不会期望 function 隐式返回它调用的 function 的 output。

def get_a_string():
    return "Hello, world!"

def call_get_a_string():
    get_a_string()

print(call_get_a_string())  # This prints nothing.

但是 DAG 或步骤模板可以转发输出

您可以通过设置其outputs字段来使 DAG 或步骤模板转发output。

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: get-artifacts-wftmpl
spec:
  templates:
  - name: get-artifacts
    dag:
      tasks:
      - name: get-an-artifact
        template: get-an-artifact
      - name: get-another-artifact
        depends: get-an-artifact
        template: get-another-artifact
    # This is the critical part!
    outputs:
      artifacts:
      - name: artifact-1
        from: "{{tasks.get-an-artifact.outputs.artifacts.artifact-name}}"
      - name: artifact-2
        from: "{{tasks.get-another-artifact.outputs.artifacts.artifact-name}}"
---
apiVersion: argoproj.io/v1alpha1
kind: Workflow
spec:
  templates:
  - name: print-artifact
    dag:
      tasks:
      - name: get-artifacts
        templateRef:
          name: get-artifacts-wftmpl
          template: get-artifacts 
      - name: print-artifact
        template: print-artifact
        arguments:
          outputs:
          - name: artifact
            from: "{{tasks.get-artifacts.outputs.artifacts.artifact-1}}"

继续 Python 类比：

def get_a_string():
    return "Hello, world!"

def call_get_a_string():
    return get_a_string()  # Add 'return'.

print(call_get_a_string())  # This prints "Hello, world!".

所以，在你的具体情况下......

1. 在generate-output WorkflowTemplate 的main模板中添加一个outputs部分，以从retrieve-outputs模板转发 output 工件。

    apiVersion: argoproj.io/v1alpha1 kind: WorkflowTemplate metadata: name: generate-output spec: entrypoint: main templates: - name: main outputs: artifacts: - name: message from: "{{tasks.read-outputs.outputs.artifacts.message}}" dag: tasks: #... the rest of the file...

2. 在lib-read-outputs WorkflowTemplate 的main模板中添加一个outputs部分，以转发generate-output的工件。

    apiVersion: argoproj.io/v1alpha1 kind: WorkflowTemplate metadata: name: lib-read-outputs spec: entrypoint: main templates: - name: main outputs: artifacts: - name: message from: "{{tasks.lib-wft.outputs.artifacts.message}}" dag: tasks: #... the rest of the file...